KR20020066025A - equipment grind and method manufacture bearing of prevention rust - Google Patents

Abstract

PURPOSE: A method for manufacturing corrosion-proof bearing and grinding apparatus for corrosion-proof bearing ball is provided to allow rotating shaft of bearing to be driven in a stable manner, while preventing bearing from being easily worn out. CONSTITUTION: A method comprises a first step of mixing compound zirconia ceramic powder consisting of 92.66 to 96.4 percent ZrO2, 4.95 to 5.35 percent Y2O3, 0.15 to 0.35 percent Al2O3, 0.02 percent SiO2, 0.01 percent Fe2O3, and 0.04 percent Na2O; a second step of pressing the compound zirconia ceramic powder into a ball shape; a third step of sintering the compound zirconia ceramic powder being pressed into the ball shape, at a pressure of 1 ton/cm¬2 to 2 ton/cm¬2 and temperature of 1200 Deg.C to 1400 Deg.C; a fourth step of mixing a ball(2) passed through the sintering process, with diamond powder, injecting the mixture into V-shaped grooves(8') formed at a rotating plate(8) through an injection port(7) formed at an upper press plate(6) of a grinder, and grinding the injected ball; a fifth step of washing off the ball; and a sixth step of assembling the ball to an inner wheel and an outer wheel of a bearing.

Description

Equation grind and method manufacture bearing of prevention rust

The present invention relates to a bearing, wherein the inner ring, outer ring, retainer, ball, and the like of the bearing are formed of a ceramic, such as high speed, vacuum, clean room, corrosion resistance, heat resistance, nonmagnetic material, radiation, chemical resistance, and low temperature. The present invention relates to a method for manufacturing a bearing for preventing corrosion, which can be used even in a special environment such as high temperature, conductivity, and insulation.

Conventionally, materials of steel bearings (STB 2, STS 440C, etc.) have been heat-treated to martensite to reduce friction coefficient and fatigue phenomenon. Therefore, these metal bearings are very susceptible to corrosion, so in order to eliminate the cause of corrosion, stainless steel (stainless steel) has been used in unsintered Austenite, but DI-water, acid, alkali, fume, water vapor (steam), but chemically in gas, but not physically (hard) in hardness, it has many friction coefficients between inner ring, outer ring, and ball of bearings, so it can be easily worn and the desired rolling motion due to irregular wear I can't get it.

In other words, in the case of martensite, seals are provided on both sides of the bearing housing to prevent the contact of martensite DI-water, acid, alkali, fumes, steam, and gas and to protect the oil. Is sealed in one or two layers, but there are many difficult problems in the installation configuration of the bearing, and also because the durability of the seal is very short, it requires a lot of time and cost because all parts of the bearing must be replaced. It has been used as a state non-ionized plastic and metal. Therefore, since this is a line or surface contact driving method, a severe friction coefficient is inevitably generated due to material properties, and the surface frictional force gradually increases the friction coefficient depending on the load and speed of the bearing. In addition, many of the particles generated in the LCD and semiconductor chip and the pharmaceutical production line of the pharmaceutical company will not only cause fatal defects, but also the bearing's rotational motion depending on the degree of friction coefficient. There was a problem that the defect rate of the product is increased by the shaking of the rotating shaft occurs.

The present invention is to solve such a problem, the bearing material of the inner ring, outer ring, retainer, ball, etc. of the bearing in the process of raw material treatment → molding → sintering → polishing, processing → finished product → washing → assembly Molded to have high speed, vacuum, clean room, corrosion resistance, heat resistance, nonmagnetic material, radiation, chemical resistance, low temperature, high temperature, conductivity, heat resistance, etc., DI-water, acid, It prevents chemical corrosion from alkali, fume, steam, and gas, so as to reduce the defective rate of the product as much as possible.

1 is a manufacturing process of the bearing ball according to the present invention.

Figure 2 is a block diagram of the polishing apparatus of the bearing ball according to the present invention.

Figure 3 is a bearing assembly configuration according to the present invention

<Description of Signs of Main Parts in Drawings>

1: bearing 2: bearing ball

3: inner ring 4: outer ring

5: retainer 6: pressure plate

7: entrance 8: turntable

8 ': home

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

Zirconia (ZrO ₂ ) 92.66 to 96.4%, Iturium (Y ₂ O ₃ ) 4.95 to 5.35%, Alumina (Al ₂ O ₃ ) 0.15 to 0.35%, Silicon oxide (SiO ₂ ) 0.02%, Iron oxide (Fe ₂ O ₃ ) 0.01 %, A composite zirconia ceramic powder comprising a composition of 0.04% sodium oxide (Na ₂ O), a molding step of pressing the composite zirconia ceramic powder in the form of a ball, and a pressure of 1 ton / cm 2 to the press molding step Sintering at 2 ton / cm 2, firing temperature of 1200 ° C. to 1400 ° C., and the sintered ball 2 is mixed with diamond powder, through the inlet 7 provided on one side of the upper press plate 6 of the polishing machine. And a process of drawing into the groove (8 ') of a plurality of grooves formed in a plurality of processes, and washing the ball that has been completely polished in the polishing process, and washing the ball into the inner ring (3) and the outer ring ( 4) is made of the process of assembling.

According to the present invention made of such a manufacturing process, first, materials such as the inner ring 3, the outer ring 4, the retainer 5, the ball 2 of the bearing 1 are ceramics, and the respective molds are designed. Prepare. At this time, the condition that the mold has to be in order to mass-produce the product should be basically durable, and the surface of the product should be smooth and excellent products can be produced without the crack of the mold.

Thus, the present invention is a raw material thereof to be for the production of balls of the relevant bearing to facilitate Wheeled zirconia (ZrO _2), yitu volume (Y2O _3), alumina (Al ₂ O _3), silicon oxide (SiO _2), iron oxide A raw material capable of forming a bearing ball is prepared by mixing a composite zirconia ceramic powder composed of a composition of (Fe ₂ O ₃ ) and sodium oxide (Na ₂ O).

Zirconia (ZrO ₂₎ 92.66~96.4% the prepared composition as above, yitu volume (Y2O ₃₎ 4.95~5.35%, alumina _{(Al 2 O 3) 0.15~0.35%} , silicon oxide (SiO ₂₎ 0.02%, iron oxide ( Fe ₂ O ₃ ) 0.01%, sodium oxide (Na ₂ O) 0.04% is mixed into a mold and molded.

The mold is designed and manufactured in various types according to the size of the bearing to be molded. The specification of the composite bearing pursued in the present invention is shown in Table 1 below.

Prepare a mold corresponding to the standard of the bearing to be molded as shown in Table 1 above

The raw material of the prepared composite zirconia ceramics is added and compression molded by a press.

The compressed raw material is sintered at a pressure of 1 ton / cm 2 to 2 ton / cm 2 and a firing temperature of 1200 ° C. to 1400 ° C. in the press molding process. At this time, hydrostatic pressure molding was simultaneously performed for the purpose of improving the nonuniformity of density generated during uniaxial molding and for forming a high quality bearing in the future. Zirconia sintering used in the present invention is usually made at more than 1200 ℃ to change the firing temperature from 1,250 ℃ to 1,400 ℃ to investigate the characteristic changes such as density and shrinkage to derive the optimum manufacturing process conditions.

In addition, since the shrinkage ratio between the inner and outer diameters of the bearings differs greatly, it was judged that the shrinkage rate was accompanied by a slight difference in density from the ring-shaped bearing structure or a mechanical relationship between the structures. Therefore, in order to reflect these deviations in the final dimension, the shrinkage rate of the outer and inner diameters before and after firing was measured.

Table 2 below shows the outer diameter shrinkage according to the firing temperature and molding pressure, Table 3 shows the inner diameter shrinkage according to the firing temperature and molding pressure, Table 4 shows the thickness shrinkage according to the firing temperature and molding pressure, and Table 5 The density characteristics according to the sintering temperature and uniaxial molding pressure are shown. Table 6 shows the density characteristics according to the sintering temperature and hydrostatic pressure (CIP).

As can be seen from the above table, as the sintering temperature was increased, the sintering density of the zirconia bearing was increased. The firing temperature was 1,250 to 1,300 ° C, and the density at the time of uniaxial molding was 5.92 to 6.12 g / cm 3.

The molding pressure greatly affected the shrinkage rate at low temperatures, and the firing temperature was an important factor at 1,250 ° C.

Referring to Tables 5 and 6, the difference between uniaxial molding and hydrostatic pressure molding was influenced only by the pressure in the low temperature sintering region of 1,250 ° C. In hydrostatic molding, the density was 5.91 to 6.07 g / cm 3, and the variation was smaller than that in uniaxial molding.

As the molding pressure was increased, the shrinkage of the bearing was increased, but the molding was greatly influenced, and the value was varied in the range of 21 to 24%. At this time, the shrinkage rate is different depending on the firing temperature. When the firing temperature is high, the shrinkage rate increases, but when the temperature reaches 1,400 ℃, the shrinkage rate is slowed down.

On the other hand, the shrinkage rate by hydrostatic molding showed a 22 to 23.5% change due to a narrower range of shrinkage change than that by uniaxial molding. Bearings made by hydrostatic molding also had shrinkage as the firing temperature increased, but no significant change was observed than uniaxial molding.

After forming and sintering as described above, the bearing ball 2 is mixed with diamond powder and introduced through the inlet 7 provided on one side of the upper press plate 6 of the polishing machine, and then the rotating plate 8 is rotated, thereby polishing the abrasive on the outer surface. The powder-bearing bearing balls are drawn into the groove-shaped grooves 8 'which are formed in a large number in a circle on the rotating plate, and are processed and polished. At this time, it is important to reduce the grinding tolerance to 0.05mm as much as possible to reduce the grinding time.To make the rolling motion of the bearing smooth, the spherical degree of the ball must be very excellent. Density must be obtained.

The rotary plate driving of the polishing machine can be selectively performed by a driving motor or a third driving force provided at the bottom.

The balls drawn into the groove-shaped grooves 8 'formed in a plurality of circular shapes on the rotating plate are rotated by the rotating plate 8, and the ball 2 rotates by itself and at the same time by the upper platen. Since the ball is made while rotating and rotating between the rotating plate (8) and the pressure plate (6) is very excellent sphericity.

After finishing the polishing process, the bearing is completed when the cleaning and assembly process is completed.

Briefly summarizing the manufacturing process of the bearing of the present invention as described above, the material is formed into a composite zirconia ceramic (Seramics) powder raw material preparation → molding → sintering → polishing, processing → finished products → washing → assembly It is.

In the present invention, the inner ring, the ball, and the retainer may be formed of a composite zirconia ceramic and the outer ring may be made of metal or plastic, and the outer ring, the ball, and the retainer may be formed of the composite zirconia ceramic, and the inner ring may be formed. It can be made of metal or plastic, and the outer ring, the inner ring, the ball, and the retainer can all be molded from composite zirconia ceramic to form a bearing.

Thus, the present invention makes it possible to withstand high speed, vacuum, clean room, corrosion resistance, heat resistance, nonmagnetic material, radiation, chemical resistance, low temperature, high temperature, conductivity, heat resistance, and the like. Work process for production to prevent corrosion of bearings by etching liquid during etching of wafers, to prevent corrosion by bearing salts used in rotating shafts of machinery equipment installed on the beach, moisture of rotating shaft bearings used in ice grinders and artificial snow To prevent corrosion and chemical resistance of bearings on site that come into contact with DI-water, acids, alkalis, fumes, steam, gas, etc. Corrosion can be prevented.

In order to prevent corrosion, the present invention is made by molding the outer ring, inner ring, ball, and retainer with a composite zirconia ceramic so that the rotating shaft of the bearing is stably wheeled, DI-water, acid, alkali, toxic gas (Fume), It is chemically possible in steam and gas and at the same time has a physical hardness so that it is not easily worn under a lot of friction, and corrosion does not occur for a long time without a separate sealing device to prevent contact with acid, alkali and gas. It is intended to be used.

In addition, the present invention, with the recent advances in new technology, semiconductor devices, LCD & CRT, monitor manufacturing equipment, aviation / aerospace, marine equipment, machine tools, steelmaking equipment, vacuum / high temperature / cryogenic equipment, biotechnology / physicochemical equipment, chemical manufacturing equipment By applying complex ball bearings and balls suitable for food / textile manufacturing facilities, insulating equipment, nonmagnetic applications, and various laboratory equipment, and special parts, new concept equipment technology can be supported throughout the industry including special environment and high technology fields. It became effective.

Claims (3)

In the bearing made of a synthetic resin or metal, zirconia (ZrO ₂₎ 92.66~96.4%, yitu volume (Y2O ₃₎ 4.95~5.35%, alumina _{(Al 2 O 3) 0.15~0.35%} , silicon oxide (SiO ₂₎ 0.02% A process of mixing a composite zirconia ceramic powder comprising a composition of 0.01% iron oxide (Fe ₂ O ₃ ) and 0.04% sodium oxide (Na ₂ O), A molding process of pressing the composite zirconia ceramic powder into a ball shape; Sintering at a pressure of 1 ton / cm 2 to 2 ton / cm 2 and a firing temperature of 1200 ° C. to 1400 ° C. in the press molding step; The sintered ball 2 is mixed with the diamond powder and introduced into the groove-shaped groove 8 'formed in the rotary plate 8 through the inlet 7 provided on one side of the upper press plate 6 of the polishing machine to be processed and polished. Process and The process of washing the ball polished to a complete spherical shape in the polishing process, Corrosion preventing bearing manufacturing method comprising the step of assembling the washed ball to the inner ring (3) and the outer ring (4). The method of claim 1, wherein the outer ring of the bearing, an inner ring, ball, retainer is zirconia (ZrO ₂₎ 92.66~96.4%, yitu volume (Y2O ₃₎ 4.95~5.35%, alumina _{(Al 2 O 3) 0.15~0.35%} , oxidation Method for producing a corrosion-resistant bearing, characterized in that the bearing is made of a composition of silicon (SiO ₂ ) 0.02%, iron oxide (Fe ₂ O ₃ ) 0.01%, sodium oxide (Na ₂ O) 0.04%. The ball 2 formed of the composite zirconia ceramic is mixed with the diamond powder and then introduced into the concave groove 8 'formed on the rotating plate 8 through the inlet 7 provided on one side of the upper press plate 6. The rotating device of the anti-corrosion bearing ball, characterized in that the ball is processed and polished while rotating and rotating in parallel.